Wildest Dreams is easily better than Different World, Tailgunner, and The Final Frontier, and you might be able to sell me on a couple others.

Anyway, here's my first stab at a Blind Guardian ranking:

1. Nightfall in Middle-Earth
2. At the Edge of Time3. Imaginations from the Other Side
4. Somewhere Far Beyond
5. Tales from the Twilight World
6. Follow the Blind
7. A Twist in the Myth8. A Night at the Opera
9. Battalions of Fear